摘要
文章结合藻类污染水体的特征,以铝盐改性的膨胀珍珠岩(mEP)为漂浮载体,采用溶胶凝胶-浸渍沉淀法制备漂浮型Ag系(Ag_(3)PO_(4)、Ag_(2)CrO_(4))、氮化碳(g-C_(3)N_(4))共修饰TiO_(2)的可见光催化材料,用于微囊藻毒素(MC-LR)的原位修复。对光催化材料使用SEM、N_(2)吸附/脱附、FTIR等分析方法进行材料表征。通过研究Ag_(3)PO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP和Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP 2种复合光催化材料吸附过程的反应动力学和光催化降解动力学,探讨2种材料对MC-LR的吸附和光催化降解能力。光催化除MC-LR过程中活性基团贡献率为h~+>·O_(2)->·OH。重复利用3次后,Ag_(3)PO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP和Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP对MC-LR的去除率仍可分别达到93.49%和89.96%。水中存在的腐殖酸、叶绿素均会降低2种材料对MC-LR的去除效果。同时除藻除藻毒素实验中,Ag_(3)PO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP和Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP对MC-LR的去除率分别在95%和66%左右。
Based on the characteristics of algae polluted water, aluminum salt modified expanded perlite (mEP) was used as a floating carrier for in situ remediation of microcystins -contaminated water (MC-LR). Ag series photocatalytic materials(AgPO, AgCrO) and carbon nitride (g-CN) co-modified TiOfloating photocatalysts were prepared by sol-gel impregnation precipitation method. The synthesized photocatalysts were characterized using SEM, Nadsorption/desorption and FTIR.By studying the reaction kinetics and photocatalytic degradation kinetics of AgPO-g-CN-TiO/mEP and Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP composite photocatalytic materials, the adsorption and photocatalytic degradation of MC-LR by two kinds of material were investigated. In the process of MC-LR photocatalytic degradation, the contribution order of the active group was h>·O>·OH. After three successive cycles, the removal rates of AgPO-g-CN-TiO/mEP and Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP were still remaining 93.49% and 89.96%, respectively. The coexistence of humic acid and chlorophyll in water will reduce the removal efficiency of the two photocatalytic materials for MC-LR. In the process of simultaneous removal of algal cells and MC-LR, the removal rates of MC-LR by AgPO-g-CN-TiO/mEP were about 95%, and the removal rates of MC-LR by Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP were about 66%.
作者
李晨阳
王佳忆
姜恒
刘薇
宋靖珂
王学江
LI Chenyang;WANG Jiayi;JIANG Heng;LIU Wei;SONG Jingke;WANG Xuejiang(Henan Engineering Laboralory of Envionmental Funcional Mauerials and Pollution Control,Interational Joint Laboratory on Key Techniques in Water Treatment of Henan Province,Henan Key Laboratory for Environmental Pollution Control,Key Laboralory of Yellow River and Huai River water Environment and Pollution Control of Ministry of Educ ation,School of Environment,Henan Normal Universiy,Xinxiang 453007,China;Tougji Achitecural Design(Group)Co.Lid,Shanghai 200092,China;Suale Key Laboratory of Polluion Conurol and Resource Reuse,School of Environmental Science and Engineering,Tongji University,Shanghai 20020 China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第5期34-43,共10页
Environmental Science & Technology
基金
国家自然科学基金资助项目(22008057)
河南师范大学博士科研启动项目(5101219170135)
河南师范大学博士后科研经费(5101219470222)
河南师范大学青年科学基金(2021QK07)。
